Coil support

ABSTRACT

A support made of a thermoplastic synthetic resin, for an electrical component, such as a coil, having a base with cylindrical apertures in which connecting pins are inserted. The pins comprise strips of twisted metal the width of which is equal to the diameter of the apertures.

United States Patent 1191 DeGroot May 22, 1973 COIL SUPPORT [75]Inventor: Jacob DeGroot, Emmasingel, Eind- [56] References C'tedNetherlands UNITED STATES PATENTS [73] Ass'gnea g' g g Cwporamn New2,483,801 10 1949 Becwar 1 3,223,900 12/1965 Wittwer ..317 242x [22]Filed: Sept. 24, 1971 Appl. No.: 183,451

Foreign Application Priority Data Oct. 3, 1970 Netherlands ..70l4556 US.Cl. ..336/l92, 336/107, 336/198,

339/220 C, 339/221 M Int. Cl ..H01j 15/10 Field of Search ..339/220 R,220 C,

339/220 T, 221 R, 221 M; 336/192, 198, 208, 107; 317/242, 101C PrimaryExaminer-E. A. Goldberg Attorney-Frank R. Trifari {5 7] ABSTRACT Asupport made of a thermoplastic synthetic resin, for an electricalcomponent, such as a coil, having a base with cylindrical apertures inwhich connecting pins are inserted. The pins comprise strips of twistedmetal the width of which is equal to the diameter of the apertures.

2 Claims, 2 Drawing Figures I Patented May 22,, 1973 IN VENTOR.

JACOB DE GROOT Agent con. SUPPORT The invention relates to a support ofa thermoplastic synthetic resin for an electrical component,particularly a coil. The support is the type having a base which isprovided with apertures in which solderable connecting pins areinserted. Supports of this kind are preferably used for manufacturingcoils which are suitable for soldering into a printed circuit. Such asupport usually consists of a circular-cylindrical portion on which thecoil is wound. This portion is formed from thermoplastic synthetic resinas one assembly with the base. After the coil has been wound, the endsof the coil wire are soldered to the connecting pins. A drawback thereofis that the connecting pins transfer heat to the synthetic resin duringsoldering, so that the latter becomes soft, thus causing the pins towork loose or change their alignment.

The object of the invention is to provide a construction considerablyeliminating this drawback. According to the invention, this object isachieved by providing connecting pins which consist of a strip ofconducting material, twisted over at least the portion of its lengthwhich engage the aperture. The apertures are round holes, the diameterof which is approximately equal to the width of the strips.

In this construction the transfer of heat to the synthetic resin isreduced because the crosssection of the twisted strip is considerablysmaller than that of a round pin which fits in the same hole, and thecontact area between the connecting pin and the synthetic resin isreduced from the entire inner wall of the aperture to a double helicalline.

A reduction of the heat transfer might also be achieved by using anon-twisted strip-shaped pin instead of a round pin, but this solutionis objectionable because such a pin is poorly secured in a directionperpendicular to the plane of the strip, i.e. preventing the pin fromassuming a position other than the desired position. By twisting theportion of the pin engaging the aperture, preferably over at least 90,the pin is secured in all directions. The twisted shape offers theadditional advantage that, in the event the synthetic resin along thecontact line with the pin should happen to become soft anyway, a helicalgroove would be produced in the synthetic resin so that the pin will notdrop out of the aperture, but remains screwed in.

In order that the invention may be readily carried into effect, oneembodiment thereof will now be described in detail, by way of example,with reference to the accompanying diagrammatic drawing, in which:

FIG. 1 is a side view of a coil which is wound on a support according tothe invention, and

FIG. 2 shows a longitudinal section on an enlarged scale through aportion of the support of FIG. 1 which is important for the invention.

The coil shown in FIG. 1 is wound on a circularcylindrical former 3,which forms a support together with a base 5. The coil former 3 canaccommodate a ferro-magnetic core 7 which is to be screwed in foradjusting the inductance of the coil.

In the base 5 are recessed grooves 9 which extend in FIG. 1 from theupper edge to the lower edge of the base and in which the wire ends 11of the coil I extend, saidwire ends 11 being soldered to connecting pins13. As is shown in FIG. 2, each connecting pin 13 consists of a twistedstrip-shaped conductor which is inserted into a round aperture in thebase 5, the diameter of said aperture being approximately equal to thewidth of the strip. By twisting the connecting pin over its entirelength as shown in FIG. 2, it is possible to feed a long strip ofmaterial continuously through a twisting device and to subsequently cutconnecting pins of the desired length. This is less expensive than thetwisting of each connecting pin individually.

What is claimed is:

l. A support for an electrical component comprising a support member, abase carrying said support member, said support member and said basebeing made of a thermoplastic synthetic resinous material, a pluralityof circular apertures provided in said base, a solderable connecting pininserted in each of said apertures comprising a strip of conductingmaterial twisted at least through and over at least that portion of itslength which engages said aperture, the diameter of said circularapertures being approximately equal to the width of said strips formingthe connecting pins so that the edges thereof are in contact with theinner surface of said apertures.

2. The support according to claim 1 wherein said strip is uniformlytwisted over its entire length.

1. A support for an electrical component comprising a support member, abase carrying said support member, said support member and said basebeing made of a thermoplastic synthetic resinous material, a pluralityof circular apertures provided in said base, a solderable connecting pininserted in each of said apertures comprising a strip of conductingmaterial twisted at least through 90* and over at least that portion ofits length which engages said aperture, the diameter of said circularapertures being approximately equal to the width of said strips formingthe connecting pins so that the edges thereof are in contact with theinner surface of said apertures.
 2. The support according to claim 1wherein said strip is uniformly twisted over its entire length.